Annealing-box.



J. A. LAWRENCE.

ANNEALING BOX. 'APPLIOATION FILED 1330.13, 1912 1,80, 1 1 5, Patented Dec. 2, 1913.

JERRY A. LAWRENCE, OF BBACKENRIDG-E, PENNSYLVANIA, ASSIGNOR T0 HARRY E. SHELDON, 0F PITTSBURGH, PENNSYLVANIA.

AriNnALING-Box.

. Specification of Letters Patent.

for.

It is the object of my invention to strengthen the roofs of annealing boxes by making the roofs double, and connecting the aoofs together so as to support each other.

he r00 5 of annealing boxes are very liable to sag by their own weight under the softening action of the intense soaking heat, to which they are subjected in annealing furnaces. I

Referringto the accompanyin drawings, Figure 1 is a side view of the pre erred form of annealing box with my improvements shown in dotted lines; Fig. 2, a vertical section of Fig. 1; and Fig. 3, a plan view of %n the drawing, 1 represents the sides of the annealing box, 2'the ends thereof,'and 3 the roof as a whole. The sides 1 are strengthened by vertical ribs or rails 4 of steel cast therein or sliddown ingrooves therein. The top member 5 of the roof is arched from the top of one side to the top of the other side. I have shown this member conforming to an arc drawn from the center, marked 6, midway between the sides ,1. The lower member 7 of the roof also arched from one side of the annealing box to the other, conforms to an arc having the same radius as the member 5, but having its center 8 suflicigntly below the center 6 .to space the roofmembws 5 and 7 apart In" order that the sand core may be removed between the roof-members, I provide the lower member with a suitable number of openings 10, which also serve to equalize the temperature and pressure between the main chamber of the annealing box and the cham-' ber between the roof-members.

It is seen that the roof-members mutually support each other by means of the spacers 9. The lower roof-memberis shielded from the direct attack of the furnace heat and assists to prevent the upper roofme'mber from sagging, this member being exposed directly to the heat of the furnace.

I cl-aim 1. In an annealing box, a top composed of twospaced roofs, one above the other, the roofs being rigidly connected with the sides, and means rigidly connected to the two roofs for spacing them apart and connecting them together at a plurality of places between the s1 es.

2. In-an annealing box, a top composed of two spaced roofs, one above the other, the roofs being rigidly connected with the sides, and means rigidly connected to the two roofs for spacing them apart and connecting them together, one of the roofs having openings'connecting the space between the roofs with the interior of the box.

' 3. In an annealing box, a top composed of two spaced roofs, one above-the other and means for rigidly connecting one root to the other at a plurality of places between the sides.

at. In an annealing box, a roof composed of two spaced members, one above the other, the lower member having openings connecting the interior of the box with the space between the spaced members.

Signed at Pittsburgh, Pa, this 9th day of December, 1912.

JERRY A. LAWRENCE.

Witnesses:

F. N. BARBER, ANNA R. BEATTY.

Patented Eee. 2, 19313. 

